Explain the ways to verify the identity of communication entities by digital signature, digital certificate, SSL and Internet. Digital certificate is not a digital ID card, but a seal or seal stamped by an identity authentication institution (or a signature added to a digital ID card).

SSL——SSL certificate can also be an SSL certificate, which is a digital certificate conforming to the SSL protocol and issued by the global trusted certificate authority (CA) after verifying the identity of the server. Installing SSL certificate on the website server can realize the dual functions of website authentication and data encryption transmission, which refers to the level of website server authentication certificate.

SSL certificate has the functions of server authentication and data transmission encryption. The certificate has three evaluation levels, among which the EV SSL certificate is the highest, the OV SSL certificate is the second, and the DV SSL certificate is the weakest.

Https——https protocol is the sum of http protocol and SSL protocol. It is to establish an encrypted channel between the client (browser) and the server (website) to ensure that the data will not be stolen or tampered with during transmission and prevent the website from being counterfeited.

Generally speaking, the above different types of certificates complement each other. Digital signature, SSL and https are all subsets of digital certificates, just as https is a secure version of http. If you want to apply for SSL certificate, you may wish to choose SSL digital certificates from many global authoritative CA institutions such as Symantec, Geotrust, Comodo and RapidSSL.